Timer disk



E. W. TURNER TIMER DISK Filed March 10, 1924 7 IN VENTOR.

A TTORNE Y.

Patented Jan. 6, 1925.

UNITED STATES EARL W. TURNER, OF KOKOMO, INDIANA.

TIMER DISK.

Application filed March 10, 1924. Serial No. 698,220.

To all whom it may concern:

Be it known that I, EARL WV. TURNER, a citizen of the United States,residing at Kokomo, in the county of Howard and State of Indiana, haveinvented certain new and useful Improvements in Timer Disks, of whichthe following is a specification.

This invention relates to a timer disk for ignition systems employed inconnection with internal combustion engines, and has for its object toprovide, in a manner as hereinafter set forth, a timer disk having meanswhereby the life thereof is materially increased, or in other words toprevent the breaking down and rapid deterioration of the insulation fromwhich the body portion of the disk is set up.

In order that timer manufacturers can eliminate machine operations, itis necessary that they use a molded insulation material for the disk andwhich afiords many advantages over a machine product. It is well knownthat the body portion, or face of the disk is subjected to a very severeburning and areing condition at the point where the contact is made andbroken, that is on each side of the contact element molded into the bodyof the disk. WVhen the contact is made on a timing device without acircuit breaker, there is a very noticeable flash occurring at thispoint and also when the contact is broken on the opposite side of thecontact element there is another flash which is much more severe than atthe point where contact is made and the result is the breaking down andthe rapid deterioration of the material from which the body portion ofthe disk is molded. To overcome this breaking down and rapiddeterioration of the insulation is the essential object of thisinvention and which is accomplished by a protective medium arranged inabutting relation with re spect to the contact elements molded in thebody portion of the disk.

The protection of the body portion can be accomplished in one instanceby inserting a body of laminated insulation or other material on eachside of a contact element at the points of make and break of the contactand with the laminated insulation molded in the body of the disk andwhich enables the employment of a molded disk with the advantage oflaminated insulation at the particular points subject to flash.

The protection of the body or face portion' can be accomplished inanother manner by setting up an annulus of laminated insulation and withthe annulus provided with openings through which extend the contactelements. The walls of the openings in the annulus snugly engage theedges of the contact elements. The annulus of laminated insulation wouldabsorb the flash and wear to which the timing disk is subjected, andfurther form the wearing face of the disk, or in other words, theannulus of laminated insulation would form the front face of the diskand the molded insulation the other part thereof, and by thisarrangement a wearing face would be set up that would be immune fromflash and burning and still the advantage retained of the molded bodyportion of the disk.

Further objects of the invention are to provide a timer disk, which issimple in its construction and arrangement, strong, unusually durable,thoroughly etficient in its use, and inexpensive to manufacture.

With the foregoing and other objects in view, the invention consists ofthe novel construction, combination and arrangement of parts, ashereinafter more specifically described and illustrated in theaccompanying drawings, wherein is shown an embodiment of the invention,but it is to be understood that changes, variations and modificationscan be resorted to which come within the scope of the claims hereuntoappended.

In the drawings wherein like reference characters denote correspondingparts throughout the several views Figure 1 is a front elevation of atimer disk in accordance with this invention.

Figure 2 is a rear elevation thereof.

Figure 3 is a section on line 3-3, Figure 1.

Figure 4 is a section on line H, Figure 1.

Figure 5 is a rear elevation of a modified form.

Figure 6 is a section on line 66, Figure 5.

Figure 7 is a section on line 77, Figure 5.

Figure 8 is a section on line 8-8, Figure 5. a

As before stated timer manufacturers, in the manufacture of timer disks,to eliminate machine operations employ a molded insulation material suchas bakelite or other insulation, and which affords many advantages overa machine product, and as before stated the molded body is subjected toa very severe burning and arcing condition at the point where contact ismade and broken. To prevent this severe burning and arcing condition,the body. portion of the disk has connected therewith lamintedinsulation, as it has been found that laminated bakelite or laminatedfiber is not subject to burning and arcing like the molded bakelite orinsulationmaterial, However, the laminated insulation cannot be moldedbut must' be "connected to or inserted in the molded insulation fromwhich the body portion of the disk is setup;

Referring to Figures 1 to 4 of the drawings, l denotes a disk formed ofmolded insulation material, such as bakelite and provided with acentrally disposed opening 2. Integral with and projecting from the disk1 is a sleeve 3 of the same material from which the disk 1 is molded,and said sleeve 3 has an inwardly extending flange 4, to which issecured a metallic disk 5, formed with a threaded opening 6. The sleeve3 and disk 1 are molded together and simultaneously with the moldingthereof there is embedded therein, a series of metallic contact plates 7provided with openings 8, having threaded walls and said openings 8register with openings 9 in the disk 1. Circuit connections, notshown,are connected to the contact plates 7, at openings 9, by machine screws,and the said plates 7 are flush with the forward face of the disk 1. Theforegoing construction and arrangement is well known and such foregoingconstruction is improved to prevent-the breaking down and rapiddeterioration of the forward face 10 of the disk 1, and to accomplishthis object, at each side of a contact plate 7 is embedded in the disk 1a protective element 11 formed of laminatedbakelite or laminated fiber,or of other suitable laminated insulation material.

Each of the protective elements 11 is rectangular in contour andpreferably of the same thickness as the thickness of a plate 7, andfurther each element 11 is flush with the forward face 10 of the disk 1and with the outer face of the plate 7 With each plate 7 there isassociated a pair of protective elements 11 and these latter abutagainst the side edges of the plate. The elements 11 are flush at theirends with the ends of the plate 7.

In Figure 1 of the drawing, a carbon brush holder is indicated in dottedlines, as

'bakelite, and a forward section 14 of lami' nated insulation material,such as bakelite or fiber. The sections 13 and 14 are of the samecontour and the section 13 has integraltherewith the sleeve 3 of moldedinsulation material. Embedded in the section 13 as well as projectingforwardly therefrom are the contact plates 15 of the same constructionand arrangement as the contact plates 7 and each of the plates 15extendsinto an opening 16 formed in the sect-ion 14. The wall of eachopening 16 snugly engage the edges of the plate 15. The section 14surrounds the plates 15 and these latter have their outer face flushwith the forward face of the section 14 The material of the moldedsection 13 snugly adheres to the section 14.

Although the plates 15 are illustrated as being embedded partly into thesection 13, yet if desired, the plates 15 can be of the same thicknessas the thickness of the section 14 and the material of section 13 willadhere to the plate 15 and also the material of the section 14 willengage the edges of the plates to secure the latter in position.

Preferably the plates 7 and 15 are notched, as at 17, so that the moldedmaterial from which the disk 1 or section 13 is set up will extend intothe notches and anchor the plates.

Preferably the disk 1 or section 13 is constructed of molded bakelitewhich is very serviceable from the standpoint of wear, however, it willnot stand flash or burning action and by protecting the points which aresubjected to flash or burning action the use of bakelite as a wearingpart is retained with the advantages of protection at the flashingpoint.

Bakelite is made in two forms, one is in powder which is molded intobakelite pieces by being transferred into liquid form and allowed tocure, and the other is laminated bakelite consisting of pulp and clothcombined and which is impregnated with liquid bakelite, The laminated'bakelite will withstand burning and flashing action which liquidbakelite molded into pieces will not stand. It is very desirable to usemolded bakelite from the standpoint of economy for eliminating machineoperations, and in addition pieces can be made which will conform to anyparticular requirements, which, of course, is a great advantage, then byprotecting the molded bakelite at the flash or burning points a timingdisk is obtained which is unusually desirable. It is to be statedhowever, that any other suitable character of insulation capable ofbeing molded and any suitable character of laminated insula tion can beemployed in the timer disk con-. struction.

\Vhat I claim is 1.. A timer disk comprising a body formed of molded andlaminated insulation material and further including contact elements,said laminated insulation material providing means to prevent burningaction on the molded insulation material when said elements make andbreak contact.

2. A timer disk comprising a body formed of molded and laminatedinsulation material and further including contact elements, saidlaminated insulation material providing means to prevent burning actionon the molded insulation material when said elements make and breakcontact, said laminated insulation material abutting against saidelements.

3. A timer disk comprising a body of molded insulation material, spacedcontact elements embedded therein, and a pair of protecting elementsassociated with each of said contact elements, each pair of protectingelements abutting against a contacting element and formed of laminatedinsulation and providing means to prevent the burning of said body ofmolded insulation when said contact elements make and break contact.

4;. A timer disk comprising a body formed from molded insulationmaterial, contact elements embedded in said body and flush with theforward race thereof, and protecting elements embedded in the forwardface of said body and abutting against and flush with said contactelements, said protecting elements formed of laminated insulationmaterial.

5. A timer disk comprising a body i11- cluding molded and laminatedinsulation materials and further including contacting elements, saidlaminated insulation material preventing the burning of said moldedinsulation material When said elements make and break contact.

6. A timer disk comprising a body including molded and laminatedinsulation materials and further including contact ele ments, saidlaminated insulation material arranged at each side of each of saidelements and constituting means to prevent the burning of the moldedinsulation material when said element-s make and break contact.

7. A timer disk comprising a body of molded insulation material, aseries of spaced contact elements embedded in said body and flush withthe forward face thereof, and a series of protecting elements eachconsisting of laminated insulation material and each arranged at a sideof each of said contact elements, and said protecting elements providingmeans to prevent the burning of said molded body of insulation when thecontact elements move into and out of contact.

8. A timer disk comprising a body of molded insulation material, aseries of spaced contact elements embedded in said body and flush withthe forward face thereof, and a series of protecting elements eachconsisting of laminated insulation material and each arranged at a sideof each of said contact elements and said protecting elements providingmeans to prevent the burning of said molded body of insulation when thecontact elements move into and out of contact, each of said protectingelements being rectangular in contour and of the same thickness as thethickness of a contact element.

In testimony whereof, I aliiX my signature hereto.

EARL W. TURNER.

